linux-kernel - Re: [PATCHSET cgroup/for-3.16] cgroup: iterate cgroup_subsys

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Date:	Wed, 14 May 2014 12:21:25 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	<cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<hannes@...xchg.org>
Subject: Re: [PATCHSET cgroup/for-3.16] cgroup: iterate cgroup_subsys_states
 directly

Hi Tejun,

On 2014/5/10 5:31, Tejun Heo wrote:
> Hello,
> 
> Currently, while csses (cgroup_subsys_states) have ->parent linkage
> too, only cgroups form full tree through their ->children and
> ->sibling fields and css iterations naturally is implemented by
> iterating cgroups and then dereferencing the css for the specified
> subsystem.
> 
> There are now use cases where controllers need to iterate through
> csses regardless of their online state as long as they have positive

What use cases are we talking about here?

> reference.  This can't easily be achieved by iterating cgroups because
> its css pointer array needs to be cleared on offline and there may be
> multiple dying csses for a cgroup for the same subsystem and there's
> only one pointer per cgroup-subsystem pair.
> 

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